Sectional ladder



(No Model.)

H. H. LANG. SEGTIONAL LADDER.

No. 518,961. Patented May 1, 1894.

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ATENT Enron.

HENRY H. LANG, OF BUFFALO, ASSIGNOR. TO WALTER M. BROWN, OF

ALBANY, NEW YORK.

SECTIONAL LADDER. s

SPECIFICATION forming part of Letters Patent No. 518,961, dated May 1, 1894.

Application filed June 19, 1 8 9 3.

To all whom it may concern.-

Be it known that I, HENRY H. LANG, a citizen of the United States of America, residing at Buffalo, Erie county, New York, have invented certain new and useful Improvements in Sectional Ladders; and'I do hereby declare the following to be a full,'clear, and exact description of theinvention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

The object of my invention is to provide a 7 new and improved sectional ladder.

In thedrawings Figure 1, shows a side elevation of one of my rungs; Fig. 2, a similar view of a rung with a portion of its side broken away showing it to be a tube; Fig. 3, a front elevation of two sections of my ladder set together in operative construction, and Fig. 4, a side elevation of one of the side bars.

The sections 1 and 2 are arranged so that the upper end of the lower section and the lower end of the upper will lie together-as shown in Fig. 3, the U shaped opening 6 in the lower ends of the side bars of the upper section setting astride of the prolonged rung 3 while the U shaped openings in the upper ends of the side bars of the lower section wholly or partly embrace the lower rung in the uppersection forming a union of the two sections that prevents all fiexion of the j ointure so made. The ends of the prolonged rung 3 protrude beyond the outer faces of the side bars of the upper section sufficiently to allow of the ends of the rung, which are threaded, to carry a threaded nut5 and leave room for enough back slack to the nut to allow of setting the sections together easily,and then tightening the nut and firmly holding the sections together, the nut being turned by means of the wings 7. The ends of-the prolonged rung 3, which is preferablya tube or piece of common gas pipe, forming a refractory rung, is preferably upset after the nut 5 is in place, so as to prevent the nut 5 from being backed off the end of the rung, the upset being shown at 8,- and the threads on the rung at 4. I prefer the upset 8 in preference to any other Serial No. 478,152. (No model.)

form of offset as it is easily made by simply turning over the whole or a part of the end of the rung. The rung 3 is held fast in the side bars 1 preferably by means of pins 9 driven through the side bars and the holes 10 in the rung.

Heretofore sectional ladders have been made having a prolonged rungmade in parts or sections by setting sockets or thimbles on the end of thesaid rung and setting a headed bolt in said socket or thimble, the outer or threaded endof the bolt forming the extreme end of the rung and such rungs I denominate compound rungs as they are formed of pieces or in sections while my rung I denominate a unit rung, as it is in one unbroken whole and I have so termed it in the claims to distin-- guish it from such compound rungs. With all compound rungs, the difficulty has been that the parts work loose and soon become troublesome, and where one part is made of wood and the rest of metal, the shrinking of the wood is partly the cause of this difficulty, which difficulty I have overcome by employing a unit rung as shown. Ladders of this general description have also been made in which the overlapping ends of the united sections have been locked together by means of collars and pins, the pins being attached to the device by means of a chain to prevent loss, the said pin when in place preventing the sections from separating but, such pins would rust and become bent and would not operate readily and I have overcome this difliculty by threading the ends of my rung and using a threaded nut which is kept from loss' by the upset on the end of the rung thus providing a cheaper and more serviceable look ing device. The operation of my device is as follows: The sections being set together 'as shown in Fig. 3, the nut 5 is turned tightly against the outer surface of section 2 which pinches or crowds the sections together and holds them in place and when it is desired to remove them the nut 5 is slacked back until the sections can be taken apart but, in slacking back on the nut the upset 8 prevents the nut from disengaging with the end of the rust from stopping the action of the nut, the

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threads are made coarse and work loose and a little oil will readily cause the nut to turn.

What I claim is-- 1. In asectionalladder, a unit rung pr0jeoting beyond the outer faces of the side bars when in extension,the outer ends thereof being threaded and carrying athreaded nut and arranged to allow of back slack to said nut when the sections are in extension, the ends of the rung being provided with a projection arranged to preventthenut frombeing backed off the rung substantially as described.

2. In a sectional ladder, a refractory tubular unit rung projecting beyond the outer faces of the side bars when in extension, the

outer ends of said rung being threaded and carrying a threaded nut meshing with the threads on the rung, said rung being arranged to allow of back slack to said nut when the sections of the ladders are in extension, the ends of the rung having an offset that the nut may not be backed off the rung substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

HENRY H. LANG.

XVitnesses:

Jos. J. GUNNELL, A. G. INGERSOLL. 

